Rehmannia (Rehmannia Glutinosa) is the name that unites the genus of six flowering species in the Lamiales order, although the plant doesn't belong to any of the families due to particular molecular structure. Although, some classifications attribute it to the Scrophulariaceae family. This perennial herb is native to the East – Korea, China, and Japan. Its origin defined its place in the Oriental herbal medicine where it is one of the 50 basic herbs used in blends and individually. The plant is known as dìhuáng (earth yellow) in Chinese medicine. Rehmannia is recognized by the bell-shaped flowers of yellowish or reddish-violet color and leaves growing close to the ground. The plant usually grows up to 15-30 cm. 

Rehmannia is traditionally used to relieve conditions associated with fever or inflammation, including Arthritis, Asthma and Urticaria (nettle rash).

It is also regarded as a potent tonic for the adrenal glands and nervous system, and so may be especially beneficial when these and other conditions are associated with Stress and Fatigue.

Herbalists sometimes combine rehmannia with Licorice, which is also traditionally used as an adrenal tonic. The two herbs have some similar properties, however unlike Licorice, rehmannia is safe for use by patients who suffer from hypertension (high blood pressure).

As rehmannia is traditionally used to aid the management of haemorrhagic bleeding and for spotting between periods (metrorrhagia), the herb can also be used to support the health of the female reproductive cycle. It may be particularly useful when these symptoms are accompanied by premenstrual FATIGUE, Depression and reduced STRESS tolerance.

In such circumstances rehmannia is often taken with Withania and Rhodiola, both of which also help to raise energy levels and enhance the body's ability to cope with STRESS. In addition to its benefits for women, this trio of herbs is specifically indicated for men experiencing erectile dysfunction or libido problems.